
Ultimate access to all questions.
For a thorough comparison, both the existing and new models are run concurrently for 6 weeks to compute the 1-day 99% VaR. Throughout this period, the new model does not report any exceedances and consistently produces lower VaR estimates than the old model. The analyst argues that the lack of exceedances indicates the new model's accuracy and urges the bank's model evaluation team to approve it. Following an expedited review by a junior analyst, which contrasts with the standard comprehensive evaluation process that normally spans several weeks and involves a senior team member, the evaluation team approves the new model for use by the trading desk.
Which of the following statements accurately summarizes the outcome of this model replacement?
A
Delta-normal VaR is more appropriate than historical simulation VaR for assets with non-linear payoffs.
B
Changing the look-back period and weighting scheme from 3 years, equally weighted, to 4 years, exponentially weighted, will understate the risk in the portfolio.
C
Overnight examination by the junior analyst increased the desk's exposure to model risk due to the potential for incorrect calibration and programming errors.
D
A 99% VaR model that generates no exceedances in 6 weeks is necessarily conservative.